Compact electronic device with thermal management
This application is directed to a passively-cooled electronic device including a housing, a plurality of electronic assemblies and a plurality of thermally conductive parts. The electronic assemblies are enclosed in the housing, and include a first electronic assembly and a second electronic assembly. The first and second electronic assemblies are disposed proximately to each other within the housing, and the second electronic assembly is substantially sensitive to heat, including heat generated by operation of the first electronic assembly. The thermally conductive parts are coupled between the first electronic assembly and the housing, and configured to create a first plurality of heat conduction paths to conduct the heat generated by the first electronic assembly away from the second electronic assembly without using a fan. At least a subset of the thermally conductive parts mechanically supports one or both of the first and second electronic assemblies.
1. An electronic device, comprising:
a lens assembly;
a housing that encloses the lens assembly;
a first electronic assembly and a second electronic assembly enclosed in the housing;
a first structure coupled between the first electronic assembly and the housing, wherein the first structure is configured to create a first plurality of heat conduction paths to conduct heat generated by the first electronic assembly away from the second electronic assembly without using a fan;
a second structure coupled between the second electronic assembly and the housing, wherein the second electronic assembly is disposed within a recess created by the first structure, and wherein the second structure is disposed at least partially within the recess created by the first structure and mechanically supports the second electronic assembly within the first structure.
2. The electronic device of claim 1 , wherein the first and second electronic assemblies are disposed proximately to each other within the housing, and the second electronic assembly is substantially sensitive to heat, including the heat generated by the first electronic assembly.
3. The electronic device of claim 1 , wherein at least a portion of the first structure mechanically supports one or both of the first and second electronic assemblies.
4. The electronic device of claim 1 , wherein:
the first structure includes a receiver structure, wherein the receiver structure is disposed on top of a first surface of the first electronic assembly; and
the second structure includes a mount structure, wherein the mount structure is configured to fit into the receiver structure and support the second electronic assembly on a front-facing interior surface of the mount structure.
5. The electronic device of claim 4 , wherein the receiver and mount structures are separated by one or more separation spots that are equally distributed on a respective edge of each of the receiver structure and the mount structure.
6. The electronic device of claim 5 , wherein:
the receiver structure is configured to absorb a first part of the heat generated by the first electronic assembly; and
the mount structure is configured to create a second plurality of heat conduction paths to conduct heat on the second electronic assembly to the housing without using a fan, and come into contact with the receiver structure via the one or more separation spots that thermally separate the receiver structure and the mount structure.
7. The electronic device of claim 6 , further comprising:
one or more second thermal pads configured to physically and thermally couple a peripheral exterior surface of the receiver structure to an interior surface of the housing, the one or more second thermal pads being configured to conduct the first part of the heat generated by the first electronic assembly from the receiver structure to the housing of the electronic device in accordance with a first heat conduction path of the first plurality of heat conduction paths.
8. The electronic device of claim 4 , wherein a bottom exterior surface of the mount structure is separated from a bottom interior surface of the receiver structure by an air gap.
9. The electronic device of claim 4 , wherein a bottom exterior surface of the mount structure is separated from a bottom interior surface of the receiver structure by a piece of solid thermal insulator.
10. The electronic device of claim 4 , wherein a bottom exterior surface of the receiver structure is coupled to the first surface of the first electronic assembly via one or more first thermal pads that are disposed on one or more hot spots of the first electronic assembly.
11. The electronic device of claim 1 , wherein the first electronic assembly is configured to provide one or more processors and memory of the electronic device, and the second electronic assembly includes at least one of an image sensor array and a graphics processing unit.
12. The electronic device of claim 1 , wherein the second electronic assembly includes an image sensor array, and the lens assembly is at least partially disposed in the recess created by the first structure in alignment with the image sensor array.
13. The electronic device of claim 1 , wherein the first structure includes a speaker box disposed between the first electronic assembly and the housing.
14. The electronic device of claim 1 , wherein the first structure includes a speaker box thermally coupled to a second surface of the first electronic assembly via a thermally conductive sheet, and the speaker box is configured to absorb and conduct a second part of heat generated by the first electronic assembly in accordance with a second heat conduction path of the first plurality of heat conduction paths.
15. The electronic device of claim 14 , wherein at least part of the speaker box is made of a thermal plastic material configured to absorb and conduct the second part of heat generated by the first electronic assembly.
16. The electronic device of claim 14 , wherein:
one or more antennas are attached to an exterior surface of the speaker box and contained within the housing;
the thermally conductive sheet includes a cut substantially near a center of the thermally conductive sheet; and
the cut has a width that is less than a threshold cut width thereby reducing crosstalk among the one or more antennas below a threshold crosstalk level.
17. The electronic device of claim 1 , wherein the second structure includes a mount structure configured to support the second electronic assembly when a first surface of the second electronic assembly sits on a front-facing interior surface of the mount structure.
18. The electronic device of claim 17 , wherein:
the mount structure is configured to at least partially absorb and conduct heat generated by the second electronic assembly in accordance with a third heat conduction path of a second plurality of heat conduction paths;
the second structure further includes a front thermal dissipater attached on a front interior surface of the housing and opposite the front-facing interior surface of the mount structure;
the mount structure is thermally coupled to the front thermal dissipater via one or more third thermal pads; and
the front thermal dissipater is configured to at least partially absorb and conduct the heat generated by the second electronic assembly in accordance with a fourth heat conduction path of the second plurality of heat conduction paths.
19. The electronic device of claim 18 , wherein a front portion of the housing is covered by a cover glass, and the front thermal dissipater is attached to the cover glass.
20. The electronic device of claim 18 , wherein the mount structure is disposed in contact with the front thermal dissipater, and thermally coupled to the front thermal dissipater.